Headboard



FIG. 1 is a perspective view of a headboard showing my new design;

FIG. 2 is a front elevational view thereof; and,

FIG. 3 is a side elevational view, the opposite side being a mirror image thereof.

The views of the headboard not shown form no part of the claimed design. The broken lines depicting ornamentation represent environmental elements only and form no part of the claimed design. 

The ornamental design for a headboard, as shown and described. 